It's been broken in half, is what's broken about it.  Mommy System can no longer tell that this was supposed to be an acid production spell.  Just gluing it back together wouldn't fix it; the break has halved some finely carved Acid-affinity metal laid into the blade.  Even after gluing it back together, there'd be a break in the Acid-affinity mana shape, which literally only a Creation mage could remove (according to her crafting books).

A Tier-2 crafter who makes Acidic blades can't look up in a book a standard pattern of affinity mats to layer into the break, in order to cause Acid mana flowing through a repaired blade to come out in the shape the System wants to see; they're specced on DEX more than INT, in order to carve the mats finely enough into those standard patterns.  A Tier-3 crafter could figure out how to fix it, no doubt, but it's not worth their time.

It's been broken in half, is what's broken about it.  Mommy System can no longer tell that this was supposed to be an acidification-of-what's-stabbed spell.  Just gluing it back together wouldn't fix it; the break has halved some finely carved Acid-affinity metal laid into the blade.  Even after gluing it back together, there'd be a break in the Acid-affinity mana shape, which literally only a Creation mage could remove (according to her crafting books).

A Tier-2 crafter who makes Acidic blades can't look up in a book a standard pattern of affinity mats to layer into the break, in order to cause Acid mana flowing through a repaired blade to come out in the shape the System wants to see; they're specced on DEX more than INT, in order to carve the mats finely enough into those standard patterns.  A Tier-3 crafter could figure out how to fix it, no doubt, but it's not worth their time.